Recent work on the ionic and electronic properties of materials with the pyrochlore and related structures
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Pyrochlores with the general formula A2B2O7X might be promising candidates for ionic or mixed-conduction applications because of their interesting crystallographic structure which allows a wide range of possible dopant compositions.
The cubic prototype structure can be viewed as having an arrangement of fixed BO6 octahedra penetrated by a three-dimensional network of tunnels. By control of the composition, the occupancy of these tunnels can be modified. In some cases, species within the tunnels can be mobile. Possible modifications of the ionic and electronic properties of materials with this structure by doping on either A or B-site positions will be discussed.
KeywordsRadius Ratio Tungsten Bronze Pyrochlore Structure Anion Conductor Prototype Structure
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